.btn-slide4 {
    position: relative;
    display: inline-block;
    height: 50px;
    width: 200px;
    line-height: 50px;
    padding: 0;
    border-radius: 50px;
    background: #fdfdfd;
    margin: 10px;
    transition: .5s;
	/* 控制颜色 */
	border: 2px solid orange;
}


.btn-slide4:hover {
    background-color: orange;
}

.btn-slide4:hover span.circle4{
    right: 100%;
    margin-right: -45px;
    background-color: #fdfdfd;
	/* 控制颜色 */
    color: orange;
}

.btn-slide4:hover span.title4 {
    right: 40px;
    opacity: 0;
}

.btn-slide4:hover span.title-hover4 {
    opacity: 1;
    right: 40px;
}

.btn-slide4 span.circle4 {
    display: block;
    color: #fff;
    position: absolute;
    float: right;
    margin: 5px;
    line-height: 42px;
    height: 40px;
    width: 40px;
    top: 0;
    right: 0;
    transition: .5s;
    border-radius: 50%;
	/* 控制颜色 */
	background-color: orange;
}


.btn-slide4 span.title4,
  .btn-slide4 span.title-hover4 {
    position: absolute;
    right: 90px;
    text-align: center;
    margin: 0 auto;
    font-size: 16px;
    font-weight: bold;
    transition: .5s;
	/* 控制颜色 */
	color: orange;
}
 
 .btn-slide4 span.title-hover4 {
     right: 80px;
     opacity: 0;
 	color: #fff;
 }